Foldable blade sharpener



FIG. 1 is a first perspective view of a new and ornamental design for a foldable blade sharpener;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a front elevation view thereof;

FIG. 5 is a rear elevation view thereof;

FIG. 6 is a first side elevation view thereof; and,

FIG. 7 is a second side elevation view thereof. 

CLAIM The ornamental design for a foldable blade sharpener, as shown and described. 